scholarly journals Synthesis kinetics of CdSe quantum dots in trioctylphosphine oxide and in stearic acid

2005 ◽  
Vol 86 (17) ◽  
pp. 171915 ◽  
Author(s):  
B. D. Dickerson ◽  
D. M. Irving ◽  
E. Herz ◽  
R. O. Claus ◽  
W. B. Spillman ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Stearic Acid ◽  
Trioctylphosphine Oxide ◽  
Cdse Quantum Dots ◽  
Kinetics Of

Dependence of Luminescence Efficiency of CdSe Quantum Dots on Chemical Environments

2008 ◽  
Vol 8 (11) ◽  
pp. 5615-5623 ◽  
Author(s):  
Rajan Jose ◽  
Mitsuru Ishikawa ◽  
Velmurugan Thavasi ◽  
Yoshinobu Baba ◽  
Seeram Ramakrishna
Keyword(s):  
Quantum Dots ◽  
Cadmium Acetate ◽  
Trioctylphosphine Oxide ◽  
Cdse Quantum Dots ◽  
Cdse Qds ◽  
Luminescence Efficiency ◽  
Cadmium Stearate

Dependence of photoluminescence (PL) efficiency (ΦPL) of CdSe quantum dots (QDs) on coordinating solvents, precursors, and dispersing solvents was investigated. The ΦPL of CdSe QDs was ∼0.05 when synthesized at 120 °C using the precursors, cadmium acetate (CdAc) and trioctylphosphine selenide (TOPSe) in trioctylphosphine (TOP). The ΦPL was increased from 0.05 to ∼0.1 when coordinating solvents, trioctylphosphine oxide (TOPO) and hexadecylamine (HDA), were added to the above reaction mixture. The ΦPL was dramatically increased from ∼0.1 to ∼0.7 when CdAc was replaced by cadmium stearate (CdSt). The ΦPL of CdSe QDs synthesized using cadmium stearate (CdSt)/TOPSe/TOP/TOPO was measured in butanol, chloroform, hexane, and toluene and found that the ΦPL is strong dispersing solvent-dependent. The DFT analysis at b3lyp/lanl2dz level on the interaction of CdSe QDs with chemical environments showed that oxygen-containing molecules interact strongly with CdSe compared to non-oxygen containing molecules and could influence the ΦPL.

Nonexponential “blinking” kinetics of single CdSe quantum dots: A universal power law behavior

2000 ◽  
Vol 112 (7) ◽  
pp. 3117-3120 ◽  
Author(s):  
M. Kuno ◽  
D. P. Fromm ◽  
H. F. Hamann ◽  
A. Gallagher ◽  
D. J. Nesbitt
Keyword(s):  
Quantum Dots ◽  
Power Law ◽  
Cdse Quantum Dots ◽  
Universal Power Law ◽  
Kinetics Of

CdSe Quantum Dots Synthesized by Tuning the Stearic Acid Concentrations via Paraffin

2013 ◽  
Vol 583 (1) ◽  
pp. 141-147
Author(s):  
Jae Ho Kim ◽  
Hee Song Moon ◽  
Sang Ho Sohn
Keyword(s):  
Quantum Dots ◽  
Stearic Acid ◽  
Cdse Quantum Dots

Effect of Cd0.5Zn0.5S shells on temperature-dependent luminescence kinetics of CdSe quantum dots

RSC Advances ◽  
2014 ◽  
Vol 4 (82) ◽  
pp. 43800-43805 ◽  
Author(s):  
Ping Yang ◽  
Hsueh-Shih Chen ◽  
Sha Zhang ◽  
Jie Zhao ◽  
Yingying Du ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cdse Quantum Dots ◽  
Temperature Dependent ◽  
Luminescence Kinetics ◽  
Kinetics Of

Investigations on the formation kinetics of CdSe quantum dots

2000 ◽  
Vol 214-215 ◽  
pp. 698-702 ◽  
Author(s):  
D Schikora ◽  
S Schwedhelm ◽  
I Kudryashov ◽  
K Lischka ◽  
D Litvinov ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cdse Quantum Dots ◽  
Formation Kinetics ◽  
Kinetics Of

Surface Derivatization of Nanocrystalline CdSe Semiconductors

1996 ◽  
Vol 452 ◽  
Author(s):  
J.-K. Lee ◽  
M. Kuno ◽  
M. G. Bawendi
Keyword(s):  
Quantum Dots ◽  
Thermal Gravimetric Analysis ◽  
Ligand Exchange ◽  
Proton Nmr ◽  
Trioctylphosphine Oxide ◽  
Cdse Quantum Dots ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Exchange Reactions

AbstractCdSe quantum dots (QDs) with several different ligands were prepared by ligand exchange reactions of trioctylphosphine oxide (TOPO)/trioctylphosphine selenide (TOPSe) passivated QDs with an excess of new ligands, such as pyridine, 4-picoline, thiophenol, 4-(trifluoromethyl)-thiophenol, and tris(2-ethylhexyl)phosphate. We find that 85–90% of ligands passivating the surface of the QDs are the newly introduced capping species and 10–15% are native TOPO/TOPSe ligands, reflecting the incomplete exchange of the QD surface. Thermal gravimetric analysis (TGA) and quantitative proton NMR measurements show that on average only 30% of surface cadmium atoms are passivated by TOPO/TOPSe. Approximately 1/3 of these native ligands occupy sites too strongly bound to be replaced by ligand exchange reactions.

scholarly journals Influence of Thiol Capping on the Exciton Luminescence and Decay Kinetics of CdTe and CdSe Quantum Dots

2004 ◽  
Vol 108 (45) ◽  
pp. 17393-17397 ◽  
Author(s):  
Sander F. Wuister ◽  
Celso de Mello Donegá ◽  
Andries Meijerink
Keyword(s):  
Quantum Dots ◽  
Cdse Quantum Dots ◽  
Exciton Luminescence ◽  
Decay Kinetics ◽  
Kinetics Of
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